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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: Nikolay Samokhvalov <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: [email protected]
Subject: Re: [PATCH] Doc: clarify that pg_upgrade statistics transfer works cross-version
Date: Tue, 24 Mar 2026 11:04:38 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAM527d89GmcMV5GD2PXS-a3ay3YE-HVSwV4NT0_o2ySf_5v8Kw@mail.gmail.com>
References: <CAM527d_Qt9ZGt99vgTaidfObRiDH0R5F_uEfum9zHeZbc+LwCQ@mail.gmail.com>
<[email protected]>
<CAM527d89GmcMV5GD2PXS-a3ay3YE-HVSwV4NT0_o2ySf_5v8Kw@mail.gmail.com>
On Tue, Mar 24, 2026 at 05:36:42AM -0700, Nikolay Samokhvalov wrote:
> On Mon, Mar 23, 2026 at 23:59 Laurenz Albe <[email protected]> wrote:
> ...
>
> I think that your patch offers too much detail,
> like from which relations the statistics are extracted. Anybody
> who wants to know that level of detail probably has to read the
> source code anyway.
>
> How about adding a simple remark, like
>
> --- a/doc/src/sgml/ref/pgupgrade.sgml
> +++ b/doc/src/sgml/ref/pgupgrade.sgml
> @@ -837,6 +837,8 @@ psql --username=postgres --file=script.sql postgres
> all statistics, such as those created explicitly with
> <xref linkend="sql-createstatistics"/>, custom statistics added by
> an extension, or statistics collected by the cumulative statistics
> system.
> + Transferring optimizer statistics works regardless of the old
> cluster's
> + major version.
> </para>
>
> <para>
>
>
> That would work too -- my goal was just to resolve confusion.
I was under the same impression --- that it only worked with upgrades
_from_ PG 18 and later. However, I can't find any documentation on this
limitation, so why did so many think this was true? I don't think
adding anything to the docs is the right approach.
--
Bruce Momjian <[email protected]> https://momjian.us
EDB https://enterprisedb.com
Do not let urgent matters crowd out time for investment in the future.
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To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected]
Subject: Re: [PATCH] Doc: clarify that pg_upgrade statistics transfer works cross-version
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